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Problems encountered in Albanian power system by connection of new power generation units

8th International Scientific Conference Energy and Climate Change Athens, 7-9 October 2015. Problems encountered in Albanian power system by connection of new power generation units. Astrit BARDHI Myrteza BRANESHI Thomaq KOBLARA Marjola PUKA.

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Problems encountered in Albanian power system by connection of new power generation units

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  1. 8th International Scientific Conference Energy and Climate Change Athens, 7-9 October 2015 Problems encountered in Albanian power system by connection of new power generation units Astrit BARDHI Myrteza BRANESHI Thomaq KOBLARA Marjola PUKA

  2. In this paper we have study the impact of small hydropower plants in power quality of connection at power system in order to analysis the reasons that caused these anomalies and to find of the ways to overcome them.

  3. CONTENTS • A brief historical development of Small Hydropower Plants in Albania • Problems encountered by connection of new power generation units • Analysis a part of distribution network. • Conclusions

  4. A BRIEF HISTORICAL DEVELOPMENT OF GENERATION UNITS IN ALBANIA • Over 90% of Albanian electricity is produced by hydropower plants • The main hydropower plants are Ulza and Shkopeti with 25,6 MW and 24 MW capacitiesbuilt along Mat river, Koman, Fierza and Vau i Dejesbuilt along Drini riverwith 600 MW, 500 MW and 250 MWcapacities . • Also, some thermal electricity generation units were built, but during the last two decades they are out of service. • Until the end of 90’ of the last century were built many SHPs, especially in rural area.

  5. A brief historical development of Shpsin Albania • The power capacity of SHPs was around 10% of total unit’s generation in Albania in the end of 90’. • The capacity of SHPs is between 100 to 400 kW. • The most of SHPs built before 90’, due to their amortizationare out of service. • This situation continued until 2000’.During these yearsno new hydropower plants have been built.

  6. Situation of shps before 2000’

  7. Situation of shps before 2000’

  8. Situation of shps before 2000’

  9. A brief historical development of SHPs in Albania • After 2000, the privatisation schemas in energy production, tranmission and distribution network have started. • During the last years the interest of private investitors concerning to SHPs is increased. • Around 80 concessionary contracts for construction of SHPs have been approved. • The total capacity of SHPs is around 400 MW with annual energy production of 1,827 GWh.

  10. SMALL HYDRO POWER PLANTS IN ALBANIA

  11. OUR CASE OF SHP CONNECTION AT DISTRIBUTION SYSTEM

  12. OUR CASE OF SHP CONNECTION AT DISTRIBUTION SYSTEM Generation units

  13. ANOTHER CASES OF SHP CONNECTIONS AT DISTRIBUTION SYSTEM Generation units Generation units

  14. ANOTHER CASE OF SHP CONNECTION AT DISTRIBUTION SYSTEM Generation units

  15. SMALL HYDROPOWER PLANTS IN ALBANIA

  16. Energy Annual Production of SHPsconnection at 35 kV

  17. ENERGY ANNUAL PRODUCTION OF SHPsCONNECTION AT 6, 10, 20 KV

  18. Progress of small hydropower development in Albania

  19. Voltage nodes with shps, the worst scenario.

  20. IMPACT OF SMALL HYDROPOWER PLANTS ON VOLTAGE LEVEL IN REGIONAL POWER SYSTEM

  21. PROBLEMS APPEARED IN POWER SYSTEM BY SHPs These energy recourses are built on rural area, where the distribution system is a radial form. At rural electric power system, no investments were done in recent years. In some cases, the energy production by SHPs is not supported by the power transformers of substations. The transmission lines are overloaded, which can cause the interruption of the supply with electricity of consumers.

  22. PROBLEMS APPEARED IN POWER SYSTEM BY SHPs Another problem encountered is that the voltage values in some power system nodes are upper than nominal or allowed value. The private investirors are not interested about capacities of existing transmission lines or substations at regional distribution system. Development of SHPs is realised in the indepedent form and it is not in good acordance with investments of Distribution System Operator. Often, the new small hydropower plants, due to limited transmission lines capacities of distribution system, operate under their capacities.

  23. Recommendations • To improve voltage levels in the system, the first thing that we recommend is the change of the configuration of the system, from a radial network to a ring network. • Improvement of contracts of private operators with Albanian Power Corporation, in which small producers of electricity to give in or take from reactive power. • In the power system the installed new transformers must be with automatic on load tap charger. • To establish a Dispaching Center in order to monitor and analysis on line the power parameters as active and reactive power production, nodes voltage level, frequency etc.

  24. Thank You

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